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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘C++’ Category

Delphi and C++ builder Platform Status

Posted by jpluimers on 2018/12/28

Almost all pages at the Embarcadero DocWiki have an embedded product version in the URL or get redirected to one.

One of the notable exceptions is the [WayBackPlatform Status:

The following table shows supported platforms and operating systems for different RAD Studio versions.

* (star) sign next to an operating system indicates that there is a known issue with that operating system and a corresponding RAD Studio version.

To see the workaround for that particular issue, click on the name of the operating system or scroll down to the appropriate section.

It got introduced in 2015 ([WayBackNew DocWiki RAD Studio, Delphi and C++Builder Platform Status Page – Community Blogs – Embarcadero Community) and is maintained at irregular intervals.

For some history: https://web.archive.org/web/*/http://docwiki.embarcadero.com/PlatformStatus/en/Main_Page

–jeroen

via: [WayBack] Summary page showing supported platforms and OS versions for XE4 and upwards, as well as links to known issues for specific versions… – Lars Fosdal – Google+

Posted in C++, C++ Builder, Delphi, Development, Software Development | Leave a Comment »

UTF-8 support for single byte character sets is beta in Windows and likely breaks a lot of applications not expecting this (via Unicode in Microsoft Windows: UTF-8 – Wikipedia)

Posted by jpluimers on 2018/12/04

Uh-oh: [WayBack] Unicode in Microsoft Windows: UTF-8 – Wikipedia:

Microsoft Windows has a code page designated for UTF-8code page 65001. Prior to Windows 10 insider build 17035 (November 2017),[7] it was impossible to set the locale code page to 65001, leaving this code page only available for:

  • Explicit conversion functions such as MultiByteToWideChar
  • The Win32 console command chcp 65001 to translate stdin/out between UTF-8 and UTF-16.

This means that “narrow” functions, in particular fopen, cannot be called with UTF-8 strings, and in fact there is no way to open all possible files using fopen no matter what the locale is set to and/or what bytes are put in the string, as none of the available locales can produce all possible UTF-16 characters.

On all modern non-Windows platforms, the string passed to fopen is effectively UTF-8. This produces an incompatibility between other platforms and Windows. The normal work-around is to add Windows-specific code to convert UTF-8 to UTF-16 using MultiByteToWideChar and call the “wide” function.[8] Conversion is also needed even for Windows-specific api such as SetWindowText since many applications inherently have to use UTF-8 due to its use in file formats, internet protocols, and its ability to interoperate with raw arrays of bytes.

There were proposals to add new API to portable libraries such as Boost to do the necessary conversion, by adding new functions for opening and renaming files. These functions would pass filenames through unchanged on Unix, but translate them to UTF-16 on Windows.[9] This would allow code to be “portable”, but required just as many code changes as calling the wide functions.

With insider build 17035 and the April 2018 update (nominal build 17134) for Windows 10, a “Beta: Use Unicode UTF-8 for worldwide language support” checkbox appeared for setting the locale code page to UTF-8.[a] This allows for calling “narrow” functions, including fopen and SetWindowTextA, with UTF-8 strings. Microsoft claims this option might break some functions (a possible example is _mbsrev[10]) as they were written to assume multibyte encodings used no more than 2 bytes per character, thus until now code pages with more bytes such as GB 18030 (cp54936) and UTF-8 could not be set as the locale.[11]


  1. Jump up^ [WayBack“UTF-8 in Windows”Stack Overflow. Retrieved July 1, 2011.
  2. Jump up^ [WayBack“Boost.Nowide”.
  3. Jump up^ [WayBackhttps://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/strrev-wcsrev-mbsrev-mbsrev-l
  4. Jump up^ [WayBack“Code Page Identifiers (Windows)”msdn.microsoft.com.

Via [WayBack] Microsoft Windows Beta UTF-8 support for Ansi API could break things. Wiki Article of the Change… – Tommi Prami – Google+

Related, as handling encoding is hard, especially if it is changed or not your default:

–jeroen

Posted in .NET, C, C++, Delphi, Development, Power User, Software Development, Windows, Windows 10 | 2 Comments »

Finding your program with an “Access Denied” (Error code 5) after lunch break…

Posted by jpluimers on 2018/10/24

Via: [WayBack] I just returned from lunch break and found my program faulted with an “Access Denied” (Error code 5) error in a call to Mouse.GetCoursorPos and was wond… – Thomas Mueller (dummzeuch) – Google+:

All of [WayBackGetCursorPos, [WayBackGetCursorInfo and [WayBack] GetKeyState can cause an “Access Denied” (Error code 5) when they do not have permission for the current desktop (for instance the logon desktop when a screen-saver has kicked in).

Solution: write a wrapper around it then [WayBack] patch calls going to the original into the patch [WayBack] delphi – Explain errors from GetKeyState / GetCursorPos – Stack Overflow

–jeroen

Posted in .NET, C#, C++, Delphi, Development, Software Development, Windows Development | Leave a Comment »

Not just C++: Thoughts on Dealing with Signed/Unsigned Mismatch – IT Hare on Soft.ware

Posted by jpluimers on 2018/10/02

[WayBack] C++: Thoughts on Dealing with Signed/Unsigned Mismatch – IT Hare on Soft.ware.

I have seen things like this happen in way to many places, not just C/C++:

static_assert( -1 < 1U );//fails!

Take away:

Never ever use explicit casts merely to get rid of warnings (whether signed/unsigned or otherwise)

A way to set various C/C++ compilers apart: [WayBack] GitHub – shafik/determine_c_or_cpp: Determine programatically C from C++ as well as various versions

Via: [WayBack] C++: Thoughts on Dealing with Signed/Unsigned Mismatch – IT Hare on Soft.ware: Kevlin Henney – Google+

–jeroen

Posted in C, C++, Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »

Links to various Visual C++ Redistributable Packages for Visual Studio downloads (arm/x64/x86 when available)

Posted by jpluimers on 2018/01/17

Link archive so I know how to get the 64-bit ARM, 32-bit Win32/x86 and 64-bit Win64/x64 downloads for the Visual C++ Redistributable files.

Note the various names of pages and files Microsoft uses.

–jeroen

Posted in C++, Development, Software Development, Visual Studio C++ | Leave a Comment »

 
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